Page:Collected Works of Dugald Stewart Volume 1.djvu/29

. But this is not the doctrine of D'Alembert. On the contrary, he affirms, that Metaphysics and Geometry are, of all the sciences connected with Reason, those in which Imagination has the greatest share; an assertion which, it will not be disputed, has at first sight somewhat of the air of a paradox; and which, on closer examination, will, I apprehend, be found altogether inconsistent with fact. If indeed D'Alembert had, in this instance, used (as some writers have done) the word Imagination as synonymous with Invention, I should not have thought it worth while (at least so far as the geometer is concerned) to dispute his proposition. But that this was not the meaning annexed to it by the author, appears from a subsequent clause, where he tells us, that the most refined operations of reason, consisting in the creation of generals which do not fall under the cognizance of our senses, naturally lead to the exercise of Imagination. His doctrine, therefore, goes to the identification of Imagination with Abstraction; two faculties so very different in the direction which they give to our thoughts, that (according to his own acknowledgment) the man who is habitually occupied in exerting the one, seldom fails to impair both his capacity and his relish for the exercise of the other.

This identification of two faculties, so strongly contrasted in their characteristical features, was least of all to be expected from a logician, who had previously limited the province of Imagination to the imitation of material objects; a limitation, it may be remarked in passing, which is neither sanctioned by common use, nor by just views of the philosophy of the Mind. Upon what ground can it be alleged that Milton's portrait of